This is my latest, a 1/350 full scratch Suffren, as she was at the time of the Dardenelles campaign.

This is around 80% built. Still have the davits, boats and a lot of other stuff to make and add. A lot of this is also dry-fit, so its a little wonky on the bridges until they are finally set in place permanently

the aft stack on your model has 1 pipe somewhat attached to it centerline whereas the drawing shows 2 pipes on same stack but on a 45 degree from the center of the stack port side. how big is your drawing file as mine is 9.71mb containing 20 drawings of that ship? you have a date typo in the title as you have it as 1889 not 1899.

a small point and at this stage entirley corrigible when you draw the PEbut the stern-walk railing was vertical close sace railing not solid ( North star do the very item in 1/700 but I do not know if available in 1/350...)

"Tomorrow is the most important thing in life. Comes into us at midnight very clean. It's perfect when it arrives and it puts itself in our hands. It hopes we've learned something from yesterday." John Wayne

A wooden transportation box made to size (and able to fit in overhead compartments on an aeroplane) is the perfect solution for this. It takes only a modest effort to make one (it doens't need to be fancy), and you will be able to use it for many models to come. I have several at home I made for transporting figures, and for every diorama I make a custom-fit box. It also makes transport by car much more hassle- and breakage-free.

Fix the model inside so the box can be turned upside down without problems. A good amount of Blue Tack is usually sufficient. Also, make sure you can easily open the box, because the security staff at the airport always wants to know what is inside...

A transparent plastic box is a good alternative, and has the advantage that the security staff can readily see the contents (and you don't have to build it!). But of course, you have to find a suitable one: correct size, strudy, firmly closing lid, and easy to carry.